Clinton, who approved a deal granting Russia control of 20 percent of America's uranium assets, has criticized rival Donald Trump for allegedly wanting to "support Putin."

In paid remarks to private groups, Clinton boasted of having a personal relationship with Putin, according to excerpts released by the organization Wikileaks this weekend. Democratic operatives, including vice presidential nominee Tim Kaine, have neither confirmed nor denied the authenticity of the Wikileaks document.

In a speech to the Jewish United Fund Of Metropolitan Chicago in October 2013, the Wikileaks document cites Clinton as telling a story of bonding with Putin over the conservation of tiger populations.

"I said, 'You know, Mr. Prime Minister, we actually have some things in common. We both want to protect wildlife, and I know how committed you are to protecting the tiger,'" Clinton reportedly told the audience. "I mean, all of a sudden, he sat up straight and his eyes got big and he goes, 'You care about the tiger? I said, 'I care about the tiger, I care about the elephant, I care about the rhinoceros, I care about the whale.'"

Then, she said, Putin invited her to what she described as his "private inner sanctum."